☂️GraphQL-core v3

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We will shortly be publishing [GraphQL-core-next](https://github.com/graphql-python/graphql-core-next) as v3 of GraphQL-core. There are breaking changes as part of this release and so this issue is to track all the tasks needed to get the ecosystem ready for the upgrade.

# Publish Graphql-core v3

* [x] Make graphql-relay-py next branch compatible with core-next
* [x] Make graphene next branch compatible with core-next
* [x] Create [v2 of graphql-relay-py](https://github.com/graphql-python/graphql-relay-py/pull/21) (compatible with core v2) on PyPI
* [x] Bring graphql-core-next up to date with GraphQL.js 14.4
* [x] Close open issues of graphql-core-next as far as possible
* [x] Setup graphql-core-next repo to publish as graphql-core: https://github.com/graphql-python/graphql-core-next/pull/40
* [x] Publish v2 of graphql-relay-py on PyPI (needs maintainer rights from Syrus)
* [x] Bring graphql-relay-py [next](https://github.com/graphql-python/graphql-relay-py/tree/next) branch up-to-date with graphql-relay-js 0.6 and add type hints
* [x] Make graphql-relay-py [next](https://github.com/graphql-python/graphene/tree/next/feature/core-next) branch the new master, move old master to legacy branch
* [x] Publish v3.0.0.a0 of graphql-relay-py on PyPI
* [x] Publish last version of graphql-core-next on PyPI
* [x] Create legacy branch of graphq-core-next from master
* [x] Change distribution name and version of GraphQL-core-next to GraphQL-core and set version to 3.0.0a0 in master branch
* [x] Publish GraphQL-core 3.0.0a0 on PyPI
* [x] Add notice to old graphql-core repository README that this is now deprecated
* [x] Make sure automatic deployment of GraphQL-core 3 on new tags works
* [x] Publish v3.0.0.b0 of graphql-relay-py and graphql-core
* [x] Publish v3.0.0 final of graphql-relay-py and graphql-core

# Pin dependant packages (not blocking)

* [x] [Graphene](https://github.com/graphql-python/graphene)
* [x] [GraphQL-server-core](https://github.com/graphql-python/graphql-server-core)
* [x] [GraphQL WS](https://github.com/graphql-python/graphql-ws)
* [x] [GraphQL-relay](https://github.com/graphql-python/graphql-relay-py) https://github.com/graphql-python/graphql-relay-py/pull/20
- [x] Master up to date
- [x] New release published
* [x] [GQL](https://github.com/graphql-python/gql) https://github.com/graphql-python/gql/pull/47
* [ ] [aiohttp-graphql](https://github.com/graphql-python/aiohttp-graphql) https://github.com/graphql-python/aiohttp-graphql/pull/11
- [x] Master up to date
- [ ] New release published
* [ ] [flask-graphql](https://github.com/graphql-python/flask-graphql) https://github.com/graphql-python/flask-graphql/pull/60
- [x] Master up to date
- [ ] New release published
* [ ] [sanic-graphql](https://github.com/graphql-python/sanic-graphql) https://github.com/graphql-python/sanic-graphql/pull/17
- [ ] Master up to date
- [ ] New release published
* [ ] [webob-graphql](https://github.com/graphql-python/webob-graphql) https://github.com/graphql-python/webob-graphql/pull/8
- [ ] Master up to date
- [ ] New release published
* [x] [dagit](https://github.com/dagster-io/dagster/blob/master/python_modules/dagit/setup.py) https://github.com/dagster-io/dagster/pull/1549

# Clean-up (not blocking)

* [ ] Make gql-next work with core v3.0.0
* [ ] Rename gql to gql-legacy and gql-next to gql, or merge gql-next into gql
* [ ] Rename graphql-core to graphql-core-legacy and graphql-core-next to graphql-core, or merge graphql-core-next into graphql-core, see #241

Bắt đầu với các mục trong checklist chưa được đánh dấu của aiohttp-graphql, flask-graphql, sanic-graphql, webob-graphql, gql và các tác vụ đổi tên repository; các pull request bên ngoài được liên kết cung cấp ngữ cảnh hiện tại. Hoàn tất có nghĩa là xác nhận các bản phát hành package còn lại và công việc dọn dẹp, nhưng tracking issue này không có một file, test hoặc entry point duy nhất để bắt đầu.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.